Drill Bits Manufacturers Introduce The twist drill is one of the tools with the highest wear. The semi-closed cutting environment and special drill geometry make the drilling temperature of twist drill higher than that of turning and milling under the same cutting dosage conditions, and the cutting speed of the drill edge and the friction speed between the drill edge and the cutting surface are distributed in a triangular gradient along the radial direction. Affected by this, different areas of the drill edge have different wear processes and characteristics, and with the increase of the drill speed or diameter, this difference in wear characteristics will also be intensified.